Identifying strip for use in connection with insulated electrical conductors



Feb. 25, 1941. FREYDBERG 2,232,846

IDENTIFYING STRIP FOR USE IN CONNECTION WITH INSULATED ELECTRICALCONDUCTORS Filed June 24, 1959 GENE/M750 CELLl/L 06E IN VENT OR.

ATTORNEYS Patented Feb. 25, 1941 PATENT OFFICE IDENTIFYING STRIP FOR USEIN CONNEC- TION CONDUCTORS WITH INSULATED ELECTRICAL Eli Freydberg, NewYork, N. Y., assignor to Freydberg Bros, Inc., New York,

of New York N. Y., a corporation Application June 24, 1939, Serial No.280,919

4 Claims.

'' ductor; to provide such a strip which is adapted to withstandtemperatures such as those used in saturating the cotton coating of theconductor; and to provide such a strip which is stronger and moreheat-resistant than sheets or films of Cellophane.

Other objects of the invention will in part be obvious and will in partappear hereinafter.

The invention accordingly comprises an article of manufacture possessingthe features, properties, and the relation of elements which will beexemplified in the article hereinafter described and the scope of theapplication of which will be indicated in the claims.

For a fuller understanding of the nature of the invention, referenceshould be had to the accompanying drawing, in which:

Figure 1 represents diagrammatically and in perspective a compositesheet or strip embodying the invention; and

Fig. 2 represents an insulated conductor withsuch a sheet or strip beingincorporated in the coating of the metallic core thereof.

Attempts to provide identifying, strips of indicia-Ibearing Cellophane,or regenerated cellulose, in connection with commercial insulatedelectric conductors, have heretofore been unsatisfactory, for if therubber insulating coating of the metallic core of the conductor iscovered with a Cellophane strip bearing suitable identifying indi'cia,

and-if the strip is then covered with a suitable.

or film of Cellophane, for example a sheet or film approximately .0009of an inch in thickness, which is provided with a coating on its outeror exposed surface of a cellulose ether, and more specifically a coatingof ethyl cellulose. This coating may be approximately .0003 of an inchin thickness, giving to the entire composite sheet a thickness slightlyin excess of one mil.

Such a sheet is shown diagrammatically in Fig. 1, where the compositesheet I0 comprises a regenerated cellulose film P2 to which a thin filmof ethyl cellulose I4 is suitably bonded.

To provide identification, the Cellophane strip I! may bear indicia,such for example as the letters l6, printed preferably upon that face ofthe sheet to which the ethyl cellulose coating is subsequently applied.If the ethyl cellulose coating is then provided with a pigment,indicated by the stippling in Fig. 1, the effect is of a two-colorprinting process, and many desired combinations of colors, printing,designs, etc., may be employed to provide a vast number of differentidentifying indicia.

Such a composite sheet possesses much greater resistance to heat, andmore particularly to the temperatures used ordinarily in treating thecotton thread coating of the conductror with a hot saturant, than does astrip of Cellophane. The

composite sheet for example, will withstand temperatures in theneighborhood of 350 F. without deterioration. J

The composite sheet is preferably wrapped or folded around the rubberinsulation 20, which surrounds the metallic core 22 of the electricalconductor 30, shown for example in Fig. 2, and the sheet or film I0 ispreferably so positioned around the rubber insulation that the ethylcellulose coating 14 is on the outer surface of the sheet. The cottoncovering 24 is then applied and the conductor may be subjected to thestandard hot saturation process without fear of destroying the layer IDas an identification. The composite layer maintains its form, its colorproperties and its'other physical properties as a strip bearingidentifying indicia, even after being comprise any cellulose estercoated with any compatible cellulose ether.

Since certain changes in carrying out the above process, and certainmodifications in the article which embody the invention may be madewithout departing from its scope, i-t'is intended that' all mattercontained in the above description or shown in the accompanying drawingshall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended .tocover all the generic and specific features of the invention hereindescribed, and all statements of the scope oi the invention which, as amatter of language, might be said to fall therebetween.

Having described my invention, what I claim I as new and desire tosecure by Letters Patent is:

ing said core, an outer covering entirely impregnated with a saturant,and an identification strip positioned intermediate said outer coveringand said insulation layer and comprising a printed sheet of regeneratedcellulose, and with a coating on its outer surface of ethyl cellulose ofsuch thickness as to protect said regenerated cellulose fromdeterioration at temperatures of approximately 300 F.

3. An insulated electrical conductor comprising a metallic core, anouter covering entirely impregnated with a saturant, and anidentification strip positioned intermediate said outer covering andsaid metallic core and comprising a sheet of regenerated cellulosebearing identifying indicla, with a coating on its outer surface ofethyl cellulose of such thickness as to protect said regeneratedcellulose from deterioration at temperatures of approximately 300 F.

4. An insulated electrical conductor comprising a metallic core, anouter covering entirely impregnated with a saturant, and anidentification strip positioned intermediate said outer covering andsaid metallic core and comprising a sheet of regenerated cellulosehaving a thickness of approm'mately .0009 of an inch, and with a coatingon its outer surface of ethyl cellulose having a thickness of about0.0003 inch.

ELI FREYDBERG.

